<!DOCTYPE html>
<html>
  <head>
    <title>hello world</title>
    <meta charset="utf-8">
  </head>
  <body>
    <div id="react">
      <!-- my react app renders here -->
    </div>
    <script src="js/react.js"></script>
    <script src="js/react-dom.js"></script>
    <script>
      ReactDOM.render(
        React.DOM.p(null, "组件开始渲染：Hello world!"),
        document.getElementById("react")
      );
    </script>
  </body>
</html>